untreated

adjective

un·​treat·​ed ˌən-ˈtrē-təd 

: not treated

untreated wastewater

especially : not improved or controlled medically

an untreated case of pneumonia

untreated diabetic patients

Synonyms

• crude
• unprocessed
• natural
• raw
• native

Examples of untreated in a Sentence

untreated wool

Recent Examples on the Web

Obstructive sleep apnea, or OSA, affects about 1 billion people globally, and 80% of people who have it are unaware and untreated, according to the American Medical Association. —Matthew Glasser, ABC News, 30 June 2025

One of the most frequently responsible species for snakebites in the U.S., the rattlesnake's bites can be deadly if left untreated, especially for children and the elderly. —Alice Gibbs, MSNBC Newsweek, 27 June 2025

If untreated, heat exhaustion can progress to heat stroke, potentially causing lasting damage to the brain, heart, kidneys, and muscles, according to the Mayo Clinic. —Evan Moore, Charlotte Observer, 24 June 2025

Eagle is ready for a new family after healing from a severe leg injury that was left untreated, the San Diego County District Attorney’s Office said in a June 17 news release. —Daniella Segura, Sacbee.com, 18 June 2025

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for untreated

• accreted
• competed
• completed
• conceited
• concreted
• defeated
• deleted
• depleted
• entreated
• intreated
• maltreated
• mistreated

Medical Definition

untreated

adjective

un·​treat·​ed -ˈtrēt-əd 

: not subjected to treatment

an untreated disease